Messrs. Moony, Wormtail, Padfoot and Prongs -- These names are known by every person in Hogwarts. These names, and an envelope with a scarlet wax seal bearing the letters: MWPP.

The teachers dread it, the students revel in it...but who are these 'Marauders,' as they are called? That's just it. Nobody knows. Most every prank Hogwarts sees is at the hands of these mysterious Marauders, and the perpetrators always walk free. They could never be caught. You can’t catch phantoms.

Lily Evans is just as curious as the next student as to who these Marauders are, but her curiosity is transformed into a hungry need, when she receives a letter herself from a certain Mr. Prongs.
[This story is slightly AU, but more on that in the author's note at the end.]